喷雾干燥技术的研究进展

喷雾干燥技术一直是干燥领域的研究热点，在国内外取得了许多成果。喷雾干燥技术不断发展和完善，其应用也较为广泛，是目前常用的一种干燥技术。介绍喷雾干燥技术的原理及特点，其次介绍常用雾化器的种类，新型喷雾干燥技术，再次介绍国内外喷雾干燥技术的进展，喷雾干燥技术在各个领域中的应用，同时对今后的研究方向作出了展望。     

不同喷雾干燥方式对粉末橡胶结构与性能的影响

采用热空气喷雾干燥和过热蒸汽喷雾干燥制备粉末橡胶,并研究其干燥胶粉的形态结构及性能。FT-IR表明,热空气喷雾干燥比过热蒸汽喷雾干燥更容易引入含氧基团,造成粉末橡胶氧化分解。SEM表明过热蒸汽喷雾干燥使物料干燥程度更高,有利于水分蒸发。GPC表明热空气喷雾干燥容易破坏橡胶分子链,降低橡胶分子量,过热蒸汽喷雾干燥更能保持橡胶原有分子链。     

旋流式压力雾化器的研究应用

介绍了旋流组合式压力雾化器的结构原理，并通过对旋流式单喷嘴压力雾化特性的理论和试验研究，得出了组合式喷嘴雾化的特征参数。采用计算流体力学(CFD)技术，对喷雾干燥塔内气、固、液3相流场加以分析，优化了干燥系统的结构及工艺配置参数。以碱式硫酸铬为干燥对象，经工业化应用证明：采用该雾化装置的压力喷雾干燥系统在保证产品质量的前提下，可替代离心喷雾干燥装置，设备投资省，体积蒸发强度高，节能效果好。     

喷雾干燥及与之相关的组合干燥

该文主要叙述了喷雾干燥的机理,常见的喷雾干燥类型及一些产品干器型式的选择,介绍了部分与喷雾干燥相关的组合干燥型式,并对强化和提高干燥经济性的途径提出了建议。     

二氧化硫还原喷雾干燥制碱式硫酸铬

详细描述了一种碱式硫酸铬制备方法，重铬酸钠溶液与二氧化硫气体在还原塔内进行氧化还原反应，经调整碱度后用离心雾化式喷雾干燥机干燥，得到优质碱式硫酸铬。该方法生产过程易于流态化、连续化、自动化，且产品溶解性和鞣革活性好。目前，中国二氧化硫塔式还原喷雾干燥法生产的碱式硫酸铬正逐步替代价格高的进口铬鞣剂，并有了出口。     

多孔介质喷雾干燥过程的热质传递

多孔介质是大量干燥过程的主体，由于实际多孔介质干燥过程的复杂性，建立通用的干燥过程传热传质模型十分困难。本文通过分析喷雾干燥过程中高初始含湿多孔介质与干燥介质之间的传热传质机理以及各因素对传热传质的影响，根据马歇尔方程探讨了干燥介质与料雾之间的水蒸汽分压差在干燥过程中的变化情况，反映了多孔湿介质在喷雾干燥操作中的传热传质过程的几种特性，为确定实际生产中喷雾干燥器的操作奈件指明了新的出路。     

喷雾干燥技术研究进展和展望

喷雾干燥技术一直是干燥领域中的热点研究课题,国内外研究获得了诸多成果。本文着重讨论了喷雾干燥过程和雾化器工作原理,主要介绍了新型喷雾干燥的一些最新研究进展,主要包括:喷雾节能干燥技术、喷雾冷冻干燥技术、过热蒸汽喷雾干燥技术以及纳米喷雾干燥技术等方面的最新研究进展,同时对今后的工作及研究方向进行了展望。     

无水偏硅酸钠的工业生产

介绍了偏硅酸钠的性能、用途和生产工艺，着重介绍了沸腾床干燥法、喷雾干燥法和固定床干燥法。     

压力式喷雾干燥器工艺原理及提高效率的探讨

本文介绍喷雾干燥器的干燥工艺过程和原理,同时重点探讨压力式喷雾干燥器的干燥过程的影响因素,和提高干燥效率的几条措施。     

喷雾干燥的节能分析

喷雾干燥是能耗较大的单元操作,节能工作十分重要。对喷雾干燥过程中的热量分配作了计算分析,并根据作者对喷雾干燥过程的研究及编制的程序对各种操作因素对干燥过程能耗的影响进行了分析评价,给出了干燥过程的节能措施。     

喷雾干燥的研究进展

介绍了国内外喷雾干燥领域的最新研究进展,阐述了喷雾冷冻干燥、超临界喷雾干燥等方面的研究结果,探讨了关于喷雾干燥过程数学模拟的研究方法和结论,总结、归纳并提出了目前国内外较新的关于喷雾干燥的研究课题和方向。     

近年来喷雾干燥技术研究进展和展望

喷雾干燥是目前市场上常见的一种干燥方式,喷雾干燥过程的复杂性研究已经有很多成果,喷雾干燥的低热效率给设备研究人员和企业界留下了较大的研发空间,需要不断地去完善其流程和工艺,以满足市场和产品本身的需要。从分析喷雾干燥的研究现状入手,介绍喷雾干燥领域新的研究成果及设备与工艺的发展情况,总结并提出了目前较新的研究课题和方向。     

压力喷雾干燥在聚氯化铝生产中的应用

近几年中国开始采用喷雾干燥生产高品位固体聚氯化铝，以适应国际产品的市场要求。笔者对采用压力喷雾干燥和离心喷雾干燥生产固体聚氯化铝进行了比较，通过实例介绍了压力喷雾干燥生产应用情况，并对生产影响因素和改进措施进行了论述。     

我国喷雾干燥技术研究及进展

回顾中国喷雾干燥技术的发展历史 ,总结过去三十多年在喷雾干燥技术研究开发运用中的主要成果 ,并提出了二十一世纪中国喷雾干燥技术的研究发展方向     

喷雾干燥节能技术研究

通过从喷雾干燥所涉及的操作工艺参数和喷雾干燥工艺流程调整等方面进行探索 ,深入研究了影响喷雾干燥能耗的主要因素和相应的结果 ,并提出了针对性的解决喷雾干燥能耗高的方法 ,使得采用喷雾干燥达到理想的效果     

RECENT PROGRESS OF SPRAY DRYING IN CHINA

The development of spray drying technique during past 10 years in China is reviewed. Main achievements in research, development and utilization of three types of atomization are described and summarized. General trend of spray drying research and development in 21st century is forecasted.     

MULTI-STAGE SPRAY DRYING METHOD IN MANUFACTURING HEAVY DUTY DETERGENTS

Collision of droplets; counter-current spray dryer; drying rate; heat transfer; nonphosphated detergent; spray drying

The spray drying method of non-phosphated granular detergents is studied to decrease the amount of agglomerate particles. The formation of agglomerates is mainly influenced by the concentration of droplets in spray cloud and the water content of droplets at the time of collision. The overlaps of different spray clouds should be de- creased.

The drying rate near the nozzle zone is considerably faster than that calculated by Ranz-Marshal's equation. According to these phenomena, “Multi-stage spray drying” is developed, which is characterized by in stalling plural spraying stages in a spray dryer.

Consequently, non-phosphated detergents are manufactured with the same powder properties and productivity as phosphated detergents.     

MULTI-STAGE SPRAY DRYING METHOD IN MANUFACTURING HEAVY DUTY DETERGENTS

Collision of droplets; counter-current spray dryer; drying rate; heat transfer; nonphosphated detergent; spray drying

The spray drying method of non-phosphated granular detergents is studied to decrease the amount of agglomerate particles. The formation of agglomerates is mainly influenced by the concentration of droplets in spray cloud and the water content of droplets at the time of collision. The overlaps of different spray clouds should be de- creased.

The drying rate near the nozzle zone is considerably faster than that calculated by Ranz-Marshal’s equation. According to these phenomena, “Multi-stage spray drying” is developed, which is characterized by in stalling plural spraying stages in a spray dryer.

Consequently, non-phosphated detergents are manufactured with the same powder properties and productivity as phosphated detergents.     

Narrow tube spray drying

Spray drying conventionally necessitates relatively large or elongated drying chambers. The present study examined the possibility in shrinking the spray drying chamber into narrow tube-like geometry. The key was in utilizing fine droplets which had low transport response time. A narrow copper/steel tube spray dryer (internal diameters between 12.7 and 48.0 mm) was constructed and was fitted with a two-fluid atomizer producing droplets in the size range smaller than 10 µm. Maltodextrin, lactose, and sucrose were spray-dried. The narrow tube approach allowed direct manipulation of the drying conditions via heating or cooling along the wall of the tube. This form of manipulation in the drying conditions, surprisingly, resulted in very distinctly crystalline spray-dried sucrose particles. The tube spray dryer was further modified with a long coiled-up tube, extending the particle residence time with minimal space requirements. Endoscopic analysis revealed that particle deposition within the tube resembled loosely attached particle and granules. The tube spray drying concept can potentially be used to provide precise control of the particle drying history along the length of the drying chamber, not limited to the control of the drying conditions at the inlet or outlet of a spray dryer.